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The author investigated statistically the poor or bad harvest and famine in Tohoku district of Japan from the standpoint of agroclimatology. The data of crop yield and weather conditions during past 360 years were used for this purpose. The results are summarized as follows;1. The poor or bad harvest and famine due to both continued rain and low temperature in summer season have occurred more frequently in Iwate, Miyagi and Yamagata prefectures than in Fukushima and Akita prefectures.2. It was found that famine durations, in which famines observed frequently, occurred repeatedly with a period of about 80 years during past 360 years. Famines continued frequently for two years. A period of about 30 years was also recognized among recent famines.3. The bad harvest and famine occurred mainly around the years with a minimum number of sun spot. The famine at years with a minimum or maximum number of sun spot was caused by cool summer, but it was difficult to decide the main reason for the famines at years with ordinary number of sun spot. Before 1900 A.D., the bad harvest or famine occurred almost always when crops were damaged by an early frost.

Statistical Investigation on the Bad Harvest and Famine in Tohoku District of Japan